'97 F250 Automatic Hub Problem - Diesel Forum - TheDieselStop.com
Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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post #1 of 5 (permalink) Old 03-16-2016, 07:11 AM Thread Starter
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'97 F250 Automatic Hub Problem

I still have the automatic hubs on my truck and I love them, they have never given me a problem. I shift to 4WD and the lock right in, I shift out of 4WD put it in reverse and they disengage no problems. As far as I know these are the original hubs, never been replaced/rebuilt.
2 days ago I jump in the truck crank it up let her warm up and take off, when I get up to highway speed I can hear the hubs just whining away as if they are locked in. I pull off the side of the road and cycle it through 4WD and they disengage like normal. I get in the truck an hour later its fine no problems.
Yesterday morning I drive the truck to work and it does the hub thing again and I have to pull off and cycle through 4wd and its fine. After work 10 hours later the truck does the same thing again and I cycle through 4wd again and go on my marry way.
Now I know the first thing everyone is going to say is trash the auto hubs and get manuals, but I love my autos and going to a manual is my last resort. Also if it were just one hub doing it Iíd say it is a hub problem however it seems to be both sides thus Iím inclined to think itís a vacuum problem. Is it possible that when Iím starting the truck cold it could be priming the hubs to engage? Another reason Iím thinking it could be the vacuum pump is the day before I drove it I pulled the air intake off to get at the glow plug connector thus I was working right over the vacuum pump and maybe bumped something loose? I took a quick peak at it last night when I got home and did not see anything obviously wrong.
Like i said manual hubs are a absolute last resort, I wont the truck to look as close to stock as possible.

Thanks in advance for any guidance.
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1997 F250 Heavy Duty 7.3 Powerstroke 4x4 Crew Cab, SRW, Automatic E40D
BTS Valve Body
Tru-Cool Trans Cooler
4" Turbo Back Diamond Eye Stainless Exhaust
Tymar Air Intake
TS Six Position Chip (stock,High Idle, +50, +75, +100, +120)
Tymar HPX line in hand but no installed yet
285/75r16 BFG All-Terrain KO2
ARE LSII Custom Color Tonneau bed cover
Color match Rhino spray in bed liner
------------------------------------------
Better To Be Tried By 12 Than Carried By 6
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post #2 of 5 (permalink) Old 03-16-2016, 11:56 AM
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It's not a vacuum problem; the auto hubs don't use vacuum. I would start by checking the front outer u-joints and the needle bearings that the spindle/shaft ride on. Sometimes when there's binding up front, when you steer, the binding will cause the shaft to start turning, which I suppose would engage the auto hubs. Odd that it would happen on both sides at once, though.
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post #3 of 5 (permalink) Old 03-16-2016, 08:35 PM
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As madpogue said vacuum isn't applicable. These auto hubs are engaged via a cam/eccentric that moves when power is applied to it. Something is turning the axleshaft for this to happen and I'd check the parts madpogue suggested. Something in there isn't freewheeling correctly.
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post #4 of 5 (permalink) Old 03-17-2016, 11:32 PM
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post #5 of 5 (permalink) Old 01-07-2019, 12:32 PM Thread Starter
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Update

Have not had the issue since I replaced the front wheel/hub bearings & seals and cleaned and re-greased everything.
tbeck likes this.

1997 F250 Heavy Duty 7.3 Powerstroke 4x4 Crew Cab, SRW, Automatic E40D
BTS Valve Body
Tru-Cool Trans Cooler
4" Turbo Back Diamond Eye Stainless Exhaust
Tymar Air Intake
TS Six Position Chip (stock,High Idle, +50, +75, +100, +120)
Tymar HPX line in hand but no installed yet
285/75r16 BFG All-Terrain KO2
ARE LSII Custom Color Tonneau bed cover
Color match Rhino spray in bed liner
------------------------------------------
Better To Be Tried By 12 Than Carried By 6
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